First they tell you to ask all the questions you need to ask so that you can learn to trust him again and that he should want to answer all of them. Now they're telling you to leave because you don't trust him and you're still questioning him. O.o
You're not going to leave him so why don't you go get some therapy so that you can change your mindset to something a little more to the way that Matti has suggested will help you to put this business to bed and you can get on with your life with him in a more relaxed atmosphere. You're inability to believe him is driving an even deeper emotional gap between the two of you. So... either stay and change your attitude or leave and never have to try and change your attitude towards him again. To stay and continue to torture one another is just stupid. YOU change or YOU leave. That's the bottom line. Don't keep staying and not changing. That's codependent dysfunction.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion